We help IT Professionals succeed at work.

A question about if statements in VHDL

711 Views
Last Modified: 2013-11-13
Hey,

        I had a quick question about IF statements in VHDL, for some reason I keep getting this error:

ERROR:HDLParsers:164 - "C:/Xilinx/Workspace/Homework3/homework3.vhd" Line 23. parse error, unexpected IF

I have tried everything I could think of, and looked a little through google, but I can't figure out why it doesn't like the IF statement.

Appreciate any help on this.
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity homework3 is
    Port ( num1 : in  STD_LOGIC_VECTOR(1 downto 0);
           num2 : in  STD_LOGIC_VECTOR(1 downto 0);
           result : out  STD_LOGIC_VECTOR(3 downto 0));
end homework3;

architecture Behavioral of homework3 is

begin
	--process (num1, num2)
	--begin
	if( (num1 = "00") or (num2 = "00") ) then
		result <= "0000";
	else if( (num1 = "01") and (num2 = "01") ) then
		result <= "0001";
	else if( (num1 = "01") and (num2 = "10") ) then
		result <= "0010";
	else if( (num1 = "10") and (num2 = "01") ) then
		result <= "0010";
	else if( (num1 = "01") and (num2 = "11") ) then
		result <= "0011";
	else if( (num1 = "11") and (num2 = "01") ) then
		result <= "0011";
	else if( (num1 = "10") and (num2 = "11") ) then
		result <= "0110";
	else if( (num1 = "11") and (num2 = "10") ) then
		result <= "0110";
	else if( (num1 = "10") and (num2 = "10") ) then
		result <= "0100";
	else
		result <= "1001";
	end if;
	--end process;

end Behavioral;

Open in new window

Comment
Watch Question

Commented:
Unlock this solution and get a sample of our free trial.
(No credit card required)
UNLOCK SOLUTION

Author

Commented:
Ah, awesome.

Been programming java so long didn't occur to me as what was wrong with it.. lol.
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a sample view!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.